HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS grid-column-gap Compare Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .demo {
      display: grid;
      gap: 2rem;
      max-width: 28rem;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
    }

    .grid > div {
      padding: 1rem;
      text-align: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }

    .no-gap {
      grid-column-gap: 0;
    }

    .no-gap > div {
      background: #94a3b8;
      color: #fff;
    }

    .with-gap {
      grid-column-gap: 24px;
    }

    .with-gap > div {
      background: #4ade80;
      color: #14532d;
    }

    .label {
      margin: 0 0 0.5rem;
      font-size: 0.875rem;
      font-weight: 600;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>No Gap vs Column Gap</h1>
  <div class="demo">
    <div>
      <p class="label">grid-column-gap: 0</p>
      <div class="grid no-gap">
        <div>A</div><div>B</div><div>C</div>
      </div>
    </div>
    <div>
      <p class="label">grid-column-gap: 24px</p>
      <div class="grid with-gap">
        <div>A</div><div>B</div><div>C</div>
      </div>
    </div>
  </div>
</body>
</html>

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CSS grid-column-gap Property - No Gap vs Gap